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Theoretical study on isothermal compression technology in refrigeration cycle.

Number: 0507

Author(s) : KIM S., JUNG M., SEO G., KIM D. K., KIM M.

Summary

Isothermal compression, a technology that can ideally minimize compression work in a refrigeration cycle, can be realized by removing the heat from compression process. The concept of isothermal compression can be accomplished by multi-stage compression and intercooling processes coupled with heat exchanger, and the outdoor air is used for the intercooling. It has been applied to gas compressors for cryogenic refrigeration, but in vapor compression like general heat pumps, the condensation occurs during the compression and cooling process. In this study, the work reduction impact of isothermal compression on the heat pump cycle by simulating multi-stage compression with interstage cooling, emulating an isothermal compression process. The analysis was based on a conventional heat pump cycle, and separate operating points were considered for cooling and heating modes to design the cycle operation. The results showed that compressor power consumption could be reduced in both cooling and heating modes. In cooling mode, the work decreased by approximately 5.9%, leading to an improvement in cycle performance by up to 7.8%. However, in the heating mode, while compressor cooling reduced power consumption (approximately 7%), the capacity of the condenser decreased, resulting in a degradation of COP by approximately 5%.

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Details

  • Original title: Theoretical study on isothermal compression technology in refrigeration cycle.
  • Record ID : 30031420
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0507

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